A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called ...

Giant machines sucking carbon dioxide out of the air to fight climate change sounds like science fiction, but it's poised to be reality, with billions of dollars of support from the U.S. government.

When you push or pull with a simple machine, you are applying a force and doing work. And, if you get more force out of a machine than you put into it, then that machine has a mechanical advantage.